桥基取代的四氮杂大环配合物热力学稳定性的研究  

A STUDY OF THERMODYNAMIC STABILITY ON BRIDGE GROUP SUBSTITUTED TETRAAZAMACROCYCLE COMPLEXES

作　　者：鲁传华[1] 徐济德[2] 倪诗圣[2] 

机构地区：[1]安徽中医学院,合肥230038 [2]安徽大学化学系,合肥230039

出　　处：《无机化学学报》1993年第2期181-186,共6页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金资助项目

摘　　要：用电位pH法测得了5,5,7,12,12,14-六甲基-1,4,8,11-四氮杂环十四烷与Co^(2+),Ni^(2+),Cu^(2+),Zn^(2+)生成配合物的稳定常数。探讨了它们在水溶液中的可能结构,并对大环碳上甲基取代的取代数与稳定常数间的关系作了研究.发现它们在水溶液中结构为五配位的四方锥体。大环碳原子上的氢被烷基取代后,配合物稳定性下降,下降的主要原因是空间效应并非电子效应之故.The stability constants of the complexes between ms-Me6[14]aneN4 and Co(Ⅱ ), Ni(Ⅱ ), Cu(Ⅱ ), Zn(Ⅱ) have been measured by potentiometric method in 0.5mol · dm-3 KNO3 at 25℃ . The stability of the complexes formed Ni(Ⅱ ) with [14]aneN4, ms-Me2[14]aneN4 and ms-Me6[14]aneN4 drops as increase of methyl group attached-carbon of N-atom in [14]ancN4. The reason is mainly due to the steric effect. And electron polar effect may be neglected. These complexes may be regarded as squarc-pyramid with the axial position accu-picd by H2O on the base of the extensive Irving-Willians scries.

关 键 词：四氮杂大环 配合物 稳定性 

分 类 号：O641.4[理学—物理化学]